How do you design alternating stairs?

How do you design alternating stairs?

In an alternating tread stair design, half of each tread is removed. It’s designed such that treads alternate for each foot. One step is wide on the right side; the next step is wide on the left side. Alternating stairs also feature a staggered step design that increases tread depth at steeper angles to save space.

Are alternating tread stairs comfortable?

Alternating tread stairs offer more comfort and safety when moving up or down the house or building. While it serves the same purpose as the traditional staircase, the removed half of every tread provides more usable step depth. As a result, users get more comfort and safety by providing more stability to the foot.

How wide is a regular step?

Standard Step Height On average, American architects have used a standard stair height of 7.5 inches. On stairs built inside, the average tread width is 9 inches, while outside treads have an average width of 11 inches.

What is the depth of a stair tread?

The minimum tread depth shall be 10 inches (254 mm). The tread depth shall be measured horizontally between the vertical planes of the foremost projection of adjacent treads and at a right angle to the tread’s leading edge.

What is the unit rise of an alternating tread stair?

But with an alternating-tread stair, the difference in height between the right and left treads is the unit rise.Using the guidelines of commercially built alternating-tread stairs, I try to get the unit rise between 6-1/2 in. and 9 in. — the steeper the angle, the larger the rise.

Are alternating tread stairs a good idea for saving space?

Lloyd Alter is Design Editor for Treehugger and teaches Sustainable Design at Ryerson University in Toronto. Alternating tread stairs are terrific for saving space; you only put one foot on a tread at a time, so why make it go full width?

What are the specifications for carbon steel alternating tread stairs?

Pricing and specifications for carbon steel alternating tread stairs with a powder coat finish STAIR HEIGHT OVERALL/HANDRAIL HEIGHT STAIR RUN WEIGHT PRICE STAIR HEIGHT STANDARD OPTIONAL 56° 68° 36″ 78″ 41.75″ 28.93″ N/A 42″ 84″ 47.75″ 33.11″ 76.944# 48″ 90″ 53.75″ 37.25″ 84.936#

What is the minimum tread depth for Alternating tread stairs?

The alternating tread stair study was conducted by the Department of Industrial Engineering at Virginia Polytechnic Institute and published in the proceedings of the Human Factors Society’s 32nd Annual Meeting. pp 981-984. View findings. OSHA requires a minimum tread depth of 8.5″ for alternating tread stairs.